CVE-2026-50012

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{"affected": [{"affectedData": [{"product": "squid", "vendor": "squid-cache", "versions": [{"status": "affected", "version": "< 7.6"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*", "matchCriteriaId": "D1EAA421-658A-4C10-A77B-EA9D38A3EFB8", "versionEndExcluding": "7.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6."}, {"lang": "es", "value": "Squid es un proxy de almacenamiento en cach\u00e9 para la Web. Antes de la versi\u00f3n 7.6, debido a un error de validaci\u00f3n de entrada inadecuada en el manejo de respuestas de res\u00famenes de cach\u00e9 (peerDigestSwapInMask en src/peer_digest.cc), Squid es vulnerable a un desbordamiento de b\u00fafer basado en mont\u00edculo: el tama\u00f1o en tr\u00e1nsito de un resumen de cach\u00e9 puede ser mayor que el mask_size declarado dentro del resumen, por lo que un par de confianza que env\u00ede una respuesta maliciosamente elaborada a un mensaje de solicitud de cache_digest puede desencadenar el desbordamiento. Este ataque se limita a las instancias de Squid compiladas con la opci\u00f3n --enable-cache-digests y configuradas con entradas cache_peer. Este problema est\u00e1 solucionado en la versi\u00f3n 7.6."}], "id": "CVE-2026-50012", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-50012", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-17T14:04:19.455063Z", "version": "2.0.3"}}]}, "published": "2026-07-16T17:16:57.493", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c003bcd"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/squid-cache/squid/pull/2423"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/squid-cache/squid/releases/tag/SQUID_7_6"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-122"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "squid: memory corruption in cache_digest reply handling", "id": "2492883", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492883"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-122", "details": ["A flaw was found in Squid. Due to improper input validation, a heap-based buffer overflow can occur when processing cache digests. This issue allows a trusted server to cause a denial of service when sending specially crafted replies to cache_digest request messages."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, restrict or disable cache digest processing for cache peers by adding the appropriate settings to the squid.conf configuration file:\nDisable cache digests for any cache_peer not under direct control by adding the no-digest option. This completely removes the vulnerability for those peers at the cost of increased bandwidth. Use of HTCP or ICP as alternative protocols can reduce that cost.\n~~~\n# Example of disabling digests for an untrusted peer.\ncache_peer untrusted.server.example.com parent 3128 3130 no-digest\n~~~\nAudit the Squid configuration and ensure that all configured cache_peer entries are under direct control and are trusted. Restricting cache peering exclusively to trusted domains greatly reduces the risk of exploitation.\n~~~\n# Example of a fully trusted peer without the no-digest flag.\ncache_peer trusted.internal.example.com parent 3128 3130\n~~~"}, "name": "CVE-2026-50012", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "squid", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "squid", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "squid34", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "squid", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "squid", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "squid:4/squid", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "squid", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-50012\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-50012\nhttps://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284"], "statement": "To exploit this issue, an attacker must control a trusted cache peer server. Also, cache digests are not enabled in the default configuration. Squid deployments that do not use cache peering are not affected. Furthermore, even those that do are only vulnerable when the attacker controls a configured peer server within the same administrative domain. A compromised peer can reliably crash the Squid process via a heap-based buffer overflow during digest exchange, but code execution faces considerable practical security barriers.\nDefault Red Hat Enterprise Linux security features, including SELinux enforcement, Address Space Layout Randomization (ASLR) and NX (No-Execute) stack protection, significantly increase the difficulty of achieving arbitrary code execution, limiting the impact of this vulnerability.\nDue to these reasons, this vulnerability has been rated with a moderate severity.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "squid", "vendor": "squid-cache"}], "created": "2026-06-26T01:30:17.130355+00:00", "updated": "2026-10-17T10:15:07.061491+00:00", "vendors": ["squid-cache", "squid-cache$PRODUCT$squid"]}